JP2010219163A - Light emitting module and lamp fitting unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve high light extraction efficiency from a light emitting element, and to suppress unevenness of light intensity. <P>SOLUTION: In a light emitting module 40, a light wavelength conversion member 52 carries out wavelength conversion of light formed to be transparent and irradiated from a semiconductor light emitting element 48, and outputs the light. A transparent member 54 is attached on an output surface of the light wavelength conversion member 52. In the transparent member 54, a plurality of projections 54b is provided on the output surface where the light inputted from the light wavelength conversion member 52 is outputted. In the semiconductor light emitting element 48, an electrode pattern to which a current for light emission is supplied is formed on the light emission surface 48a. The plurality of projections 54b is provided at an arrangement interval X1 shorter than a repeating interval of the pattern in the electrode pattern. The arrangement interval X1 is set to be 300 μm or less. Each of the projections 54b is formed in a hemisphere shape. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a light emitting module and a lamp unit including the light emitting module.

  2. Description of the Related Art In recent years, for the purpose of extending life and reducing power consumption, a technology that uses a light emitting module having a light emitting element such as an LED (Light Emitting Diode) as a light source for irradiating strong light such as a lamp unit that irradiates light in front of the vehicle Development is underway. However, in order to use in such applications, not only the light emitting module emits light with white light but also the light emitting module is required to have high brightness and high luminous intensity. For this reason, for example, in order to improve the extraction efficiency of white light, a light emitting element that mainly emits blue light, a yellow phosphor that emits mainly yellow light when excited by blue light, and blue light is transmitted from the light emitting element. An illuminating device has been proposed that includes blue-transmitting yellow-based reflecting means that reflects light having a wavelength equal to or greater than that of yellow light from a yellow-based phosphor (see, for example, Patent Document 1). For example, in order to increase the conversion efficiency, a structure including a ceramic layer disposed in a path of light emitted by the light emitting layer has been proposed (see, for example, Patent Document 2).

JP 2007-59864 A JP 2006-5367 A

  For example, when it is required to realize high illuminance and luminous intensity while converting the wavelength of light emitted from the light emitting element as in the case of the lamp unit described above, it is significant to improve the light extraction efficiency from the light emitting element. It becomes a problem. However, for example, when the incident angle of light on the emission surface of the phosphor becomes larger than the total reflection critical angle, the light is not emitted but reflected inside the phosphor, leading to a decrease in extraction efficiency. . Some semiconductor light-emitting elements such as LEDs can distinguish the electrode pattern from the exit surface. Such an electrode shape of the light emitting element may lead to uneven brightness.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to realize high light extraction efficiency from the light emitting element and to suppress unevenness in luminous intensity.

  In order to solve the above-described problems, a light emitting module according to an aspect of the present invention includes a light emitting element, a transparent light wavelength converting member that converts the wavelength of light emitted from the light emitting element and emits the light, and an emission surface of the light wavelength converting member. And a transparent member that emits light incident from the light wavelength conversion member from an emission surface provided with a plurality of protrusions. In the light emitting element, an electrode pattern to which a current for light emission is supplied is formed, and the plurality of protrusions are provided at an arrangement interval shorter than the pattern repetition interval in the electrode pattern.

  According to this aspect, by first providing the protrusions on the transparent member in this way, it is possible to suppress the light reflected toward the light wavelength conversion member without being emitted from the emission surface, and high light extraction efficiency. Can be realized. Moreover, the unevenness of luminous intensity caused by the electrode pattern can be suppressed by making the arrangement interval of the protrusions shorter than the pattern repetition interval in the electrode pattern.

  Each of the plurality of protrusions may be formed in a hemispherical shape. As a result of earnest research and development by the inventor, it has been found that a higher light extraction efficiency can be realized by forming this protrusion into a hemispherical shape. Therefore, according to this aspect, it is possible to provide a light emitting module that emits light with higher luminous intensity.

  Another aspect of the present invention is a lamp unit. The lamp unit includes a light-emitting element, a transparent light wavelength conversion member that converts the wavelength of light emitted from the light-emitting element and emits the light, and the light incident on the light wavelength conversion member. And a transparent member that emits light from an emission surface provided with a plurality of protrusions, and an optical member that condenses light emitted from the light emitting module. In the light emitting element, an electrode pattern to which a current for light emission is supplied is formed, and the plurality of protrusions are provided at an arrangement interval shorter than the pattern repetition interval in the electrode pattern.

  When a light emitting element is used as an illumination source, reduction of unevenness in luminous intensity is a particularly important issue. According to this aspect, it is possible to provide a lamp unit having a higher luminous intensity and a lower luminous intensity unevenness by using the light emitting module having a high light extraction efficiency and suppressing the luminous intensity irregularity.

  Yet another embodiment of the present invention is a light emitting module. The light-emitting module includes a light-emitting element, a transparent light wavelength conversion member that converts the wavelength of light emitted from the light-emitting element and emits the light, and light incident on the light wavelength conversion member. And a transparent member that emits light from an emission surface provided with a plurality of protrusions. The plurality of protrusions are provided at an arrangement interval of 300 micrometers or less.

  As a result of earnest research and development by the inventor, it has been found that a higher light extraction efficiency can be realized by setting the protrusion interval to 300 micrometers or less. Therefore, according to this aspect, a light emitting module with high luminous intensity can be realized. Also in this case, each of the plurality of protrusions may be formed in a hemispherical shape.

  Yet another embodiment of the present invention is a lamp unit. The lamp unit includes a light emitting element, a transparent light wavelength converting member that converts the wavelength of the light emitted from the light emitting element and emits the light, and the light incident on the light wavelength converting member. And a transparent member that emits light from an emission surface provided with a plurality of protrusions, and an optical member that condenses light emitted from the light emitting module. The plurality of protrusions are provided at an arrangement interval of 300 micrometers or less. According to this aspect, it is possible to provide a lamp unit having a higher luminous intensity by using the light emitting module having a high light extraction efficiency.

  According to the present invention, it is possible to achieve high light extraction efficiency from the light emitting element and to suppress unevenness in luminous intensity.

It is sectional drawing which shows the structure of the vehicle headlamp which concerns on 1st Embodiment. It is a figure which shows the structure of the light emitting module board | substrate which concerns on 1st Embodiment. (A) is a perspective view which shows the structure of the light emitting module which concerns on 1st Embodiment, (b) is the figure which looked at (a) from the viewpoint P. FIG. (A) is a perspective view which shows the structure of the light emitting module which concerns on 2nd Embodiment, (b) is the figure which looked at (a) from the viewpoint Q. FIG. (A) is a perspective view which shows the structure of the light emitting module which concerns on 3rd Embodiment, (b) is the figure which looked at (a) from the viewpoint R. FIG. (A) is a perspective view which shows the structure of the light emitting module which concerns on 4th Embodiment, (b) is the figure which looked at (a) from the viewpoint S. FIG. (A) is a perspective view which shows the structure of the light emitting module which concerns on 5th Embodiment, (b) is sectional drawing by the plane T of (a).

  Hereinafter, embodiments of the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a cross-sectional view showing a configuration of a vehicle headlamp 10 according to the first embodiment. The vehicle headlamp 10 includes a lamp body 12, a front cover 14, and a lamp unit 16. Hereinafter, the left side in FIG. 1 will be described as the front of the lamp, and the right side will be described as the rear of the lamp. Further, the right side of the lamp in front of the lamp is called the right side of the lamp, and the left side is called the lamp left side. FIG. 1 shows a cross section of a vehicle headlamp 10 cut by a vertical plane including the optical axis of the lamp unit 16 as viewed from the left side of the lamp. When the vehicle headlamp 10 is mounted on the vehicle, the vehicle headlamps 10 formed symmetrically with each other are provided on the vehicle left front and right front, respectively. FIG. 1 shows the configuration of the left or right vehicle headlamp 10.

  The lamp body 12 is formed in a box shape having an opening. The front cover 14 is formed in a bowl shape with a translucent resin or glass. The front cover 14 has an edge attached to the opening of the lamp body 12. In this way, a lamp chamber is formed in an area covered by the lamp body 12 and the front cover 14.

  A lamp unit 16 is disposed in the lamp chamber. The lamp unit 16 is fixed to the lamp body 12 by an aiming screw 18. The lower aiming screw 18 is configured to rotate when the leveling actuator 20 is operated. For this reason, it is possible to move the optical axis of the lamp unit 16 in the vertical direction by operating the leveling actuator 20.

  The lamp unit 16 includes a projection lens 30, a support member 32, a reflector 34, a bracket 36, a light emitting module substrate 38, and heat radiating fins 42. The projection lens 30 is a plano-convex aspheric lens having a convex front surface and a flat rear surface, and projects a light source image formed on the rear focal plane as a reverse image to the front of the lamp. The support member 32 supports the projection lens 30. A light emitting module 40 is provided on the light emitting module substrate 38. The reflector 34 reflects light from the light emitting module 40 and forms a light source image on the rear focal plane of the projection lens 30. Thus, the reflector 34 and the projection lens 30 function as an optical member that condenses the light emitted from the light emitting module 40 toward the front of the lamp. The radiation fins 42 are attached to the rear surface of the bracket 36 and mainly radiate heat generated by the light emitting module 40.

  The support member 32 is formed with a shade 32a. The vehicle headlamp 10 is used as a low beam light source, and the shade 32a blocks a part of the light emitted from the light emitting module 40 and reflected by the reflector 34, so that the cut-off line in the low beam light distribution pattern in front of the vehicle. Form. Since the low beam light distribution pattern is known, the description thereof is omitted.

  FIG. 2 is a diagram illustrating a configuration of the light emitting module substrate 38 according to the first embodiment. The light emitting module substrate 38 includes a light emitting module 40, a substrate 44, and a transparent cover 46. The substrate 44 is a printed wiring board, and the light emitting module 40 is attached to the upper surface. The light emitting module 40 is covered with a colorless transparent cover 46. In the light emitting module 40, the semiconductor light emitting element 48 is directly attached on the substrate 44, and the light wavelength conversion member 52 and the transparent member 54 are laminated thereon.

  FIG. 3A is a perspective view showing the configuration of the light emitting module 40 according to the first embodiment, and FIG. 3B is a view of FIG. Hereinafter, the configuration of the light emitting module 40 will be described with reference to both FIG. 3 (a) and FIG. 3 (b). The semiconductor light emitting element 48 is configured by an LED element. In the first embodiment, a blue LED that mainly emits light having a blue wavelength is employed as the semiconductor light emitting element 48. Specifically, the semiconductor light emitting device 48 is configured by an InGaN-based LED device formed by crystal growth of an InGaN-based semiconductor layer. The semiconductor light emitting device 48 is formed as a 1 mm square chip, for example, and is provided so that the center wavelength of the emitted blue light is 470 nm. Of course, the configuration of the semiconductor light emitting device 48 and the wavelength of the emitted light are not limited to those described above.

  The semiconductor light emitting device 48 according to the first embodiment is a vertical chip type. This vertical chip type semiconductor light emitting device is configured by forming an n-type electrode on a surface to be attached to a substrate, and stacking an n-type semiconductor, a p-type semiconductor, and a p-type electrode thereon. Therefore, an electrode which is a p-type electrode of a conductor is provided on the upper surface of the semiconductor light emitting element 48, that is, on the light emitting surface side. Since such a semiconductor light emitting device 48 is known, further description is omitted. Needless to say, the semiconductor light emitting device 48 is not limited to a vertical chip type, and may be, for example, a face-up type.

  An Au wire is bonded to this electrode. A notch for bonding the Au wire to the electrode may be provided in the light wavelength conversion member 52. A current necessary for light emission is supplied to the electrode through the Au wire. In place of the Au wire, for example, an aluminum wire, a copper foil, or an aluminum ribbon wire may be used.

  The light wavelength conversion member 52 is a so-called luminescent ceramic or fluorescent ceramic, and sinters a ceramic substrate made of YAG (Yttrium Aluminum Garnet) powder, which is a phosphor excited by blue light. Can be obtained. Since the manufacturing method of such a light wavelength conversion ceramic is well-known, detailed description is abbreviate | omitted.

  The light wavelength conversion member 52 thus obtained converts the wavelength of blue light mainly emitted from the semiconductor light emitting element 48 and emits yellow light. For this reason, the light emitting module 40 emits combined light of blue light that has passed through the light wavelength conversion member 52 as it is and yellow light whose wavelength has been converted by the light wavelength conversion member 52. In this way, white light can be emitted from the light emitting module 40.

  The light wavelength conversion member 52 is transparent. In the first embodiment, “transparent” means that the total light transmittance of light in the conversion wavelength region is 40% or more. As a result of inventor's earnest research and development, if the total light transmittance of light in the conversion wavelength region is in a transparent state of 40% or more, the light wavelength by the light wavelength conversion member 52 can be appropriately converted and the light wavelength It has been found that a decrease in the intensity of light passing through the conversion member 52 can also be appropriately suppressed. Therefore, the light emitted from the semiconductor light emitting device 48 can be more efficiently converted by making the light wavelength conversion member 52 transparent.

  In addition, the light wavelength conversion member 52 is made of an inorganic material without an organic binder, and the durability is improved as compared with a case where an organic material such as an organic binder is contained. For this reason, for example, it is possible to input 1 W (watts) or more of power to the light emitting module 40, and it is possible to increase the luminance, luminous intensity, and luminous flux of the light emitted from the light emitting module 40.

  The semiconductor light emitting element 48 may be one that mainly emits light having a wavelength other than blue. Also in this case, as the light wavelength conversion member 52, one that converts the wavelength of the main light emitted from the semiconductor light emitting element 48 is employed. In this case, the wavelength of the light emitted from the semiconductor light emitting element 48 is changed so that the light wavelength conversion member 52 becomes light having a wavelength of white or a color close to white when combined with light having a wavelength mainly emitted from the semiconductor light emitting element 48. May be converted.

  When the light emitted from the semiconductor light emitting element 48 is wavelength-converted by the light wavelength conversion member 52 as described above, the light is not emitted from the emission surface of the light wavelength conversion member 52 but is reflected toward the semiconductor light emitting element 48. As a result, the light extraction efficiency may be reduced. Further, as described above, since the transparent light wavelength conversion member 52 is employed, the light intensity unevenness caused by the electrode pattern formed on the light emitting surface 48a of the semiconductor light emitting element 48 is caused by the light wavelength conversion member 52. May not be reduced. In particular, when the light emitting module 40 is used as an illumination light source such as a lamp unit, the light intensity unevenness of the light emitting module 40 itself leads to the light intensity unevenness at the place where the light is irradiated. For this reason, in the first embodiment, the transparent member 54 is attached on the emission surface 52a of the light wavelength conversion member 52 in order to improve the light extraction efficiency and reduce the luminous intensity unevenness.

  The transparent member 54 emits the light incident from the light wavelength conversion member 52 from the emission surface 54a. The transparent member 54 is formed of a material having a refractive index lower than that of the light wavelength conversion member 52. By forming the transparent member 54 with a material having a low refractive index in this manner, light can be easily incident from the light wavelength conversion member 52. A plurality of protrusions 54b are provided on the emission surface 54a. By providing the protrusion 54 b in this way, it is possible to suppress the light extraction efficiency from being lowered due to the light incident from the light wavelength conversion member 52 being reflected toward the light wavelength conversion member 52.

  Each of the plurality of protrusions 54b is formed in a hemispherical shape. As a result of earnest research and development by the inventor, it has been confirmed that by making the protrusion 54b hemispherical, it is possible to further increase the light extraction efficiency as compared with the case of other shapes. A so-called microlens array may be used for the transparent member 54.

  In the semiconductor light emitting device 48, an electrode pattern to which a current for light emission is supplied is formed on the light emitting surface 48a. For this reason, the plurality of protrusions 54b are provided at an arrangement interval X1 that is shorter than the pattern repetition interval in the electrode pattern. By making the arrangement interval X1 shorter than the pattern repetition interval in the electrode pattern in this way, it is possible to suppress unevenness in luminous intensity caused by the electrode pattern. Of course, the electrode pattern of the semiconductor light emitting device 48 is not limited to the light emitting surface 48a.

  Moreover, in 1st Embodiment, arrangement | positioning space | interval X1 shall be 1 micrometer or more and 300 micrometers or less. As a result of earnest research and development by the inventor, it has been confirmed that by arranging the protrusions 54b in this way, light extraction efficiency can be improved and unevenness in luminous intensity can be suppressed. In addition, it has been confirmed that by setting the arrangement interval X1 to 1 μm or more and 100 μm or less, better results can be obtained in light extraction efficiency and light intensity unevenness suppression. Further, the arrangement interval X1 may be less than 1 μm. In the first embodiment, the width of the protrusion 54b is the same as the arrangement interval X1. For this reason, the width | variety of the protrusion 54b shall be 1 micrometer or more and 300 micrometers or less. Note that the width of the protrusion 54b may be smaller than the arrangement interval X1.

  When the light emitting module 40 is manufactured, first, the material of the light wavelength conversion member 52 formed so that the length of the edge of the light emitting surface 48 a of the semiconductor light emitting element 48 is at least twice as large as the light wavelength conversion member 52. The formed transparent member 54 is fixed by adhesion or the like. Next, it is cut into the same size as the light emitting surface 48a of the semiconductor light emitting device 48 by dicing or the like. Thus, an optical wavelength conversion unit in which the optical wavelength conversion member 52 and the transparent member 54 are fixed to each other is created. Next, the side of the light wavelength conversion member 52 of the light wavelength conversion unit thus created is fixed to the light emitting surface 48a of the semiconductor light emitting element 48 by adhesion or the like.

  Thus, the process of adhering the light wavelength conversion member 52 and the transparent member 54 can be simplified by dicing in a state where the light wavelength conversion member 52 and the transparent member 54 are fixed in advance. Further, by attaching the light wavelength conversion member 52 and the transparent member 54 in advance to form a light wavelength conversion unit, it is possible to facilitate handling when attaching them to the semiconductor light emitting device 48.

  The light wavelength conversion member 52 and the transparent member 54 diced separately may be fixed to each other by bonding or the like. In this case, after the incident surface of the light wavelength conversion member 52 is fixed to the light emitting surface 48a of the semiconductor light emitting device 48, the incident surface of the transparent member 54 may be fixed to the emission surface 52a of the light wavelength conversion member 52. After the emission surface 52a of the light wavelength conversion member 52 and the incident surface of the transparent member 54 are fixed, the incident surface of the light wavelength conversion member 52 may be fixed to the light emitting surface 48a of the semiconductor light emitting element 48.

  Further, a space may be provided between the light emitting surface 48 a of the semiconductor light emitting element 48 and the incident surface of the light wavelength conversion member 52. Thereby, it is possible to easily route an Au wire or the like bonded to an electrode provided on the light emitting surface 48a of the semiconductor light emitting element 48. In addition, a reflective film or a reflective member may be fixed to the side surface of the light wavelength conversion unit, that is, each side surface of the light wavelength conversion member 52 and the transparent member 54. Thereby, light leaking from the side portions of the light wavelength conversion member 52 and the transparent member 54 can be suppressed, and more light can be emitted from the emission surface 54 a of the transparent member 54.

(Second Embodiment)
FIG. 4A is a perspective view showing the configuration of the light emitting module 60 according to the second embodiment, and FIG. 4B is a view of FIG. Hereinafter, the configuration of the light emitting module 60 will be described with reference to both FIG. 4 (a) and FIG. 4 (b). The configuration of the vehicular headlamp 10 is the same as that of the first embodiment except that a light emitting module 60 is provided instead of the light emitting module 40. Hereinafter, the same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The light emitting module 60 is configured in the same manner as the light emitting module 40 according to the first embodiment except that a transparent member 62 is provided instead of the transparent member 54. The transparent member 62 is also attached on the emission surface 52a of the light wavelength conversion member 52 so that the light incident from the light wavelength conversion member 52 is emitted from the emission surface 62a. The point that the transparent member 62 is formed of a material having a refractive index lower than that of the light wavelength conversion member 52 is the same as that of the transparent member 54.

  A plurality of protrusions 62b are provided on the emission surface 62a of the transparent member 62 in order to suppress a decrease in light extraction efficiency. Each of the plurality of protrusions 62b is formed in a conical shape. As a result of earnest research and development by the inventors, it has been confirmed that the light extraction efficiency can be further increased by making the protrusion 62b conical. The protrusion 62b may be formed in another cone shape such as a quadrangular pyramid or a triangular pyramid.

  Also in the second embodiment, the plurality of protrusions 62b are provided at an arrangement interval X2 that is shorter than the pattern repetition interval in the electrode pattern. It has been confirmed that when the arrangement interval X2 is 1 μm or more and 300 μm or less, good results are obtained in light extraction efficiency and light intensity unevenness suppression. It has been confirmed that by setting the arrangement interval X2 to 1 μm or more and 100 μm or less, better results can be obtained in light extraction efficiency and light intensity unevenness suppression. Further, the arrangement interval X2 may be less than 1 μm. In the second embodiment, the width of the protrusion 62b is the same as the arrangement interval X2. For this reason, the width | variety of the protrusion 62b shall be 1 micrometer or more and 300 micrometers or less. Note that the width of the protrusion 62b may be smaller than the arrangement interval X2.

(Third embodiment)
FIG. 5A is a perspective view showing the configuration of the light emitting module 70 according to the third embodiment, and FIG. 5B is a view of FIG. Hereinafter, the configuration of the light emitting module 70 will be described with reference to both FIG. 5 (a) and FIG. 5 (b). The configuration of the vehicle headlamp 10 is the same as that of the first embodiment except that a light emitting module 70 is provided instead of the light emitting module 40. Hereinafter, the same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The light emitting module 70 is configured in the same manner as the light emitting module 40 according to the first embodiment except that a transparent member 72 is provided instead of the transparent member 54. The transparent member 72 is also mounted on the emission surface 52a of the light wavelength conversion member 52 so that the light incident from the light wavelength conversion member 52 is emitted from the emission surface 72a. The point that the transparent member 72 is formed of a material having a lower refractive index than the light wavelength conversion member 52 is the same as the transparent member 54.

  A plurality of protrusions 72b are provided on the emission surface 72a of the transparent member 72 in order to suppress a decrease in light extraction efficiency. Each of the plurality of protrusions 72b is formed to have a hemispherical cross section and to extend in parallel with the emission surface 72a. Specifically, each of the plurality of protrusions 72b is formed in a shape obtained by cutting a cylinder on a plane including an axis, and the curved surface portion is arranged to constitute the emission surface 72a. Further, each of the plurality of protrusions 72b is arranged such that the axial directions are parallel to each other and the arrangement intervals X3 are substantially equal.

  Also in the third embodiment, the plurality of protrusions 72b are provided at an arrangement interval X3 that is shorter than the pattern repetition interval in the electrode pattern. It has been confirmed that when the arrangement interval X3 is 1 μm or more and 300 μm or less, good results are obtained in light extraction efficiency and light intensity unevenness suppression. It has been confirmed that by setting the arrangement interval X3 to 1 μm or more and 100 μm or less, a better result can be obtained in light extraction efficiency and light intensity unevenness suppression. Further, the arrangement interval X3 may be less than 1 μm. In the third embodiment, the width of the protrusion 72b is the same as the arrangement interval X3. For this reason, the width | variety of the protrusion 72b shall be 1 micrometer or more and 300 micrometers or less. Note that the width of the protrusion 72b may be smaller than the arrangement interval X3.

(Fourth embodiment)
FIG. 6A is a perspective view showing the configuration of the light emitting module 80 according to the fourth embodiment, and FIG. 6B is a view of FIG. Hereinafter, the configuration of the light emitting module 80 will be described with reference to both FIG. 6 (a) and FIG. 6 (b). The configuration of the vehicular headlamp 10 is the same as that of the first embodiment except that a light emitting module 80 is provided instead of the light emitting module 40. Hereinafter, the same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The light emitting module 80 is configured in the same manner as the light emitting module 40 according to the first embodiment except that a transparent member 82 is provided instead of the transparent member 54. The transparent member 82 is also attached on the emission surface 52a of the light wavelength conversion member 52 so that the light incident from the light wavelength conversion member 52 is emitted from the emission surface 82a. The point that the transparent member 82 is formed of a material having a refractive index lower than that of the light wavelength conversion member 52 is the same as that of the transparent member 54.

  A plurality of protrusions 82b are provided on the emission surface 82a of the transparent member 82 to suppress a decrease in light extraction efficiency. Each of the plurality of protrusions 82b has a triangular cross section and is formed to extend in parallel with the emission surface 82a. Specifically, each of the plurality of protrusions 82b is formed in a triangular prism shape, and is arranged so that two side surfaces constitute the emission surface 82a. In addition, each of the plurality of protrusions 82b is arranged so that the axial directions are parallel to each other and the substantially equal arrangement intervals X4.

  Also in the fourth embodiment, the plurality of protrusions 82b are provided at an arrangement interval X4 that is shorter than the pattern repetition interval in the electrode pattern. It has been confirmed that by setting the arrangement interval X4 to 1 μm or more and 300 μm or less, good results can be obtained in light extraction efficiency and light intensity unevenness suppression. It has been confirmed that by setting the arrangement interval X4 to 1 μm or more and 100 μm or less, better results can be obtained in light extraction efficiency and light intensity unevenness suppression. Further, the arrangement interval X4 may be less than 1 μm. In the fourth embodiment, the width of the protrusion 82b is the same as the arrangement interval X4. For this reason, the width of the protrusion 82b is 1 μm or more and 300 μm or less. Note that the width of the protrusion 82b may be smaller than the arrangement interval X4.

(Fifth embodiment)
FIG. 7A is a perspective view illustrating a configuration of a light emitting module 90 according to the fifth embodiment, and FIG. 7B is a cross-sectional view taken along a plane T in FIG. Hereinafter, the configuration of the light emitting module 90 will be described with reference to both FIG. 7 (a) and FIG. 7 (b). The configuration of the vehicle headlamp 10 is the same as that of the first embodiment except that a light emitting module 90 is provided instead of the light emitting module 40. Hereinafter, the same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The light emitting module 90 is configured in the same manner as the light emitting module 40 according to the first embodiment except that a transparent member 92 is provided instead of the transparent member 54. The transparent member 92 is also attached on the emission surface 52a of the light wavelength conversion member 52 so that the light incident from the light wavelength conversion member 52 is emitted from the emission surface 92a. The point that the transparent member 92 is formed of a material having a refractive index lower than that of the light wavelength conversion member 52 is the same as that of the transparent member 54.

  The transparent member 92 is mixed with a powder phosphor 94. The powder phosphor 94 is mixed so as to protrude from the emission surface 92a. Thereby, the powder fluorescent substance 94 comprises the protrusion in the output surface 92a. The powder phosphor 94 is mixed in the transparent member 92 so that an average interval, which is an average value of intervals between adjacent ones protruding from the emission surface 92a, is shorter than a pattern repetition interval in the electrode pattern. In the fifth embodiment, the average interval is 1 μm or more and 300 μm or less. It has been confirmed that by setting the average interval to 1 μm or more and 100 μm or less, better results can be obtained in light extraction efficiency and light intensity unevenness suppression. The average interval may be less than 1 μm.

  The powder phosphor 94 may have the same wavelength conversion function as the phosphor material contained in the light wavelength conversion member 52. Alternatively, the powder phosphor 94 may have a wavelength conversion function different from that of the phosphor material included in the light wavelength conversion member 52. Further, instead of the powder phosphor 94, light-transmitting powder or particles may be used. This powder or particle may be formed of a transparent material. For example, the powder or particles may be provided by crushing the same material as the transparent member 92. The light extraction efficiency can also be improved by including the transparent member 92 in this manner.

  The present invention is not limited to the above-described embodiments, and an appropriate combination of the elements of each embodiment is also effective as an embodiment of the present invention. Various modifications such as design changes can be added to each embodiment based on the knowledge of those skilled in the art, and embodiments to which such modifications are added can also be included in the scope of the present invention. Such an example is given below.

  In a modification, an optical filter is provided between the light emitting surface of the semiconductor light emitting element and the incident surface of the light wavelength conversion member in each of the above-described embodiments. The optical filter transmits blue light mainly emitted from the semiconductor light emitting element, and reflects yellow light mainly emitted by converting the wavelength of the blue light by the light wavelength conversion member. By providing the optical filter in this manner, light emitted from the semiconductor light emitting element can be used efficiently, and it is possible to suppress a decrease in luminous intensity and luminance of the light emitted from the light emitting module.

  DESCRIPTION OF SYMBOLS 10 Vehicle headlamp, 16 Lamp unit, 30 Projection lens, 34 Reflector, 40 Light emitting module, 44 Substrate, 48 Semiconductor light emitting element, 52 Light wavelength conversion member, 54 Transparent member, 54b Protrusion part

Claims (6)

A light emitting element;
A transparent light wavelength conversion member that converts the wavelength of light emitted from the light emitting element and emits the light;
A transparent member that is attached on the emission surface of the light wavelength conversion member and emits light incident from the light wavelength conversion member from the emission surface provided with a plurality of protrusions,
With
The light emitting element is formed with an electrode pattern to which a current for light emission is supplied,
The plurality of protrusions are provided at an arrangement interval shorter than a pattern repetition interval in the electrode pattern.   The light emitting module according to claim 1, wherein each of the plurality of protrusions is formed in a hemispherical shape. A light-emitting element, a transparent light wavelength conversion member that converts the wavelength of light emitted from the light-emitting element and emits the light, and a plurality of light incident on the light wavelength conversion member is attached to the light wavelength conversion member. A light emitting module having a transparent member that emits from an exit surface provided with a protrusion of
An optical member for collecting the light emitted from the light emitting module;
With
The light emitting element is formed with an electrode pattern to which a current for light emission is supplied,
The lamp unit, wherein the plurality of protrusions are provided at an arrangement interval shorter than a pattern repetition interval in the electrode pattern. A light emitting element;
A transparent light wavelength conversion member that converts the wavelength of light emitted from the light emitting element and emits the light;
A transparent member that is attached on the emission surface of the light wavelength conversion member and emits light incident from the light wavelength conversion member from the emission surface provided with a plurality of protrusions,
With
The light emitting module, wherein the plurality of protrusions are provided at an arrangement interval of 300 micrometers or less.   The light emitting module according to claim 4, wherein each of the plurality of protrusions is formed in a hemispherical shape. A light-emitting element, a transparent light wavelength conversion member that converts the wavelength of light emitted from the light-emitting element and emits the light, and a plurality of light incident on the light wavelength conversion member is attached to the light wavelength conversion member. A light emitting module having a transparent member that emits from an exit surface provided with a protrusion of
An optical member for collecting the light emitted from the light emitting module;
With
The plurality of protrusions are provided at an arrangement interval of 300 micrometers or less.

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